UITableViewCellAccessoryDetailDisclosureButton disappearing after changing UITableViewCell accessory - iphone

Question

I have a UITableView that has cells with images, text and a disclosure button. I'm loading the cells like this:
- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if(!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellIdentifier];
}
if ([indexPath row] == [[self multas] count]) {
[[cell textLabel] setText:#"Carregar mais..."];
}
else
{
Multa *multa = [self.multas objectAtIndex:indexPath.row];
NSString *dataIsolada = [[NSString stringWithFormat:[multa dataOcorrencia]] substringWithRange:NSMakeRange(0, 10)];
[[cell textLabel] setText:[NSString stringWithFormat:dataIsolada]];
[[cell detailTextLabel] setText:[multa descricao]];
[cell.imageView setImageWithURL:[NSURL URLWithString:[multa fotoURL]]
placeholderImage:[UIImage imageNamed:#"carregando.jpeg"]];
[cell.imageView setContentMode: UIViewContentModeScaleAspectFit];
[cell setAccessoryType:UITableViewCellAccessoryDetailDisclosureButton];
}
return cell;
}
When the user taps the disclosure button, I switch the disclosure button for an Activity Indicator and then push another view to the screen using a navigation controller:
- (void)carregarDetalhesMulta:(UITableView *)tableView comMulta:(Multa *)multa
{
DetalheMultaViewController *form = [[DetalheMultaViewController alloc] initWithMulta:multa];
form.delegate = self;
UINavigationController *navigation = [[UINavigationController alloc] initWithRootViewController:form];
[self presentModalViewController:navigation animated:YES];
}
- (void) tableView: (UITableView *) tableView accessoryButtonTappedForRowWithIndexPath: (NSIndexPath *) indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
UIActivityIndicatorView *spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle: UIActivityIndicatorViewStyleGray];
spinner.frame = CGRectMake(0, 0, 24, 24);
cell.accessoryView = spinner;
[spinner startAnimating];
Multa *multa = [self.multas objectAtIndex:indexPath.row];
double delayInSeconds = 0.1;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
[spinner stopAnimating];
[self carregarDetalhesMulta:tableView comMulta:multa];
[cell setAccessoryType:UITableViewCellAccessoryDetailDisclosureButton];
});
}
Note that I've changed back the accessory for a disclosure button in the end. The problem is: when I come back(by tapping the button back) to the view that contains the UITableView, the line that I've tapped show no disclosure button nor Activity Indicator. What I am doing wrong? What's the better way to switch these controls without having to reload the table view?

Answer 1

The accessoryView property has priority over the accessoryType property. If you set the accessoryView to nil, you'll see the accessory button again.

Answer 2

Here's what I understood from the question: You'd like the accessory view to be a disclosure button that when tapped, becomes an activity indicator. After a short delay, you'd like to push to a new view controller.
Here's how I would do it:
setup the prototype cell in storyboard to have Accessory:none.
add a push segue from your view controller to the destination vc you want, give it an identifier, say #"MyPushSegue"
Add the accessoryView to cells (if they don't have one) in cellForRowAtIndexPath:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell"];
// the rest of your cellForRowAtIndexPath
if (!cell.accessoryView)
cell.accessoryView = [self createAccessoryView];
return cell;
}
Create the accessory view this way (assuming ARC):
- (UIView *)createAccessoryView {
UIView *accessoryView = [[UIView alloc] initWithFrame:CGRectZero];
UIButton *disclosureButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
disclosureButton.tag = 100;
[disclosureButton addTarget:self action:#selector(pressedAccessory:) forControlEvents:UIControlEventTouchUpInside];
UIActivityIndicatorView *aiv = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
aiv.tag = 101;
aiv.alpha = 0.0;
aiv.center = disclosureButton.center;
accessoryView.bounds = disclosureButton.bounds;
[accessoryView addSubview:aiv];
[accessoryView addSubview:disclosureButton];
return accessoryView;
}
The disclosure button in the above triggers a method when the button is pressed. This method should change the state of the selector view and trigger the push segue you setup in storyboard:
- (void)pressedAccessory:(UIButton *)sender {
UIView *accessoryView = sender.superview;
[self setAccessoryView:accessoryView waiting:YES];
// let the user see the spinner for 1 seconds
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, 1 * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void) {
[self performSegueWithIdentifier:#"MyPushSegue" sender:self];
[self setAccessoryView:accessoryView waiting:NO];
});
}
Finally, to solve the problem you were having, we don't replace the accessory view with a spinner, we change how it looks by hiding/showing the button and hiding/showing the spinner, depending on what state we want:
- (void)setAccessoryView:(UIView *)accessoryView waiting:(BOOL)waiting {
UIButton *disclosureButton = (UIButton *)[accessoryView viewWithTag:100];
UIActivityIndicatorView *aiv = (UIActivityIndicatorView *)[accessoryView viewWithTag:101];
[UIView animateWithDuration:0.1 animations:^{
disclosureButton.alpha = (waiting)? 0.0 : 1.0;
aiv.alpha = (waiting)? 1.0 : 0.0;
}];
if (waiting) [aiv startAnimating]; else [aiv stopAnimating];
}